Things to do before release

These are the things that need to be done for **Release 1.0**

- [ ] Place background image in new `images` folder
- [ ] Modify speed of game
- [ ] Modify brick colors
- [ ] Maybe more ❓ ❓ ❓ ❓ ❓

The issue names no files, tests, or entry points. Start by locating the game assets and gameplay settings, then review the Release 1.0 checklist; done means placing the background image, changing game speed and brick colors, and resolving the unspecified additional work.

索引モデルが issue の本文から書いたものです。